@article{DCG_1988__3_1-2_131036,
     author = {G. Purdy},
     title = {Repeated {Angles} in {E4} .},
     journal = {Discrete & computational geometry},
     pages = {73--76},
     publisher = {mathdoc},
     volume = {3},
     number = {1-2},
     year = {1988},
     zbl = {0629.52014},
     url = {http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131036/}
}